EP0636710A1 - Method for cleaning articles - Google Patents

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Publication number
EP0636710A1
EP0636710A1 EP94109602A EP94109602A EP0636710A1 EP 0636710 A1 EP0636710 A1 EP 0636710A1 EP 94109602 A EP94109602 A EP 94109602A EP 94109602 A EP94109602 A EP 94109602A EP 0636710 A1 EP0636710 A1 EP 0636710A1
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EP
European Patent Office
Prior art keywords
propylene glycol
formula
ether
iso
weight
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Granted
Application number
EP94109602A
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German (de)
French (fr)
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EP0636710B1 (en
Inventor
Oskar Dr. Wack
Martin Dr. C/O Wack Chemie Hanek
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Wack Dr O K Chemie GmbH
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Wack Dr O K Chemie GmbH
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Publication of EP0636710A1 publication Critical patent/EP0636710A1/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
    • C23F11/173—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts

Definitions

  • the present invention relates to a method for cleaning objects according to the preamble of claim 1.
  • Objects to be cleaned are subjected to a cleaning process in a cleaning bath by immersion, optionally with ultrasound assistance, and are then freed from the cleaning bath in a first aqueous rinsing bath. Because of the impurities introduced into the first rinsing bath, a second rinsing bath is recommended for perfect rinsing, which is followed by a drying process.
  • This corrosion proves to be particularly problematic when the dried objects are to be processed further, for example by providing a coating.
  • the problem underlying the present invention is to reduce the risk of corrosion.
  • the object is achieved by a method according to claim 1.
  • an addition of a mixture of propylene glycol methyl ether and propylene glycol ether is added to the last rinsing bath.
  • a glycol ether mixture improves the outflow behavior of the water from the objects removed from the water, and the water flows out like a curtain.
  • a film-like coating is evidently formed, which offers effective protection against oxidation and corresponding corrosion for a limited period of about 24 hours.
  • the last rinsing bath consists of deionized water (deionized water) to prevent staining.
  • deionized water deionized water
  • glycol ether mixture mentioned is added to the deionized water in a concentration of about 10 percent by weight to 50 percent by weight.
  • a propylene glycol monoethyl ether of the formula has proven to be particularly suitable as propylene glycol methyl ether and as propylene glycol ether a propylene glycol n-butyl ether of the formula proven.
  • Metal parts to be cleaned made of steel are treated in a glycol ether cleaning bath and then cleaned of the residues of the cleaning bath in a first aqueous bath.
  • the parts are rinsed in a second bath from demineralized water and then dried in a hot air stream.
  • the drying time is about three minutes, it is strongly dependent on the temperature of the warm air flow and the air speed.
  • the same metal parts as in Example 1 are treated in the same cleaning bath and the residues are also cleaned in the first rinsing bath.
  • the second rinsing bath is a mixture of propylene glycol monoethyl ether of the formula and propylene glycol n-butyl ether of the formula in proportions of 80% by weight of propylene glycol monoethyl ether and 20% by weight of propylene glycol n-butyl ether.
  • the drying time could be reduced by 50% by draining the rinsing bath from the items removed after rinsing. Even after 24 hours, even with careful inspection, there was still no corrosion, within this time the dried parts could be processed without further protective measures, e.g. be coated.

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  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Detergent Compositions (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

It is proposed that a mixture of propylene glycol methyl ether and propylene glycol ether in a ratio between 60:40 and 90:10 be added to the last rinse water in which metal parts are cleaned, so as to achieve intermediate corrosion protection.

Description

Die vorliegende Erfindung bezieht sich auf ein Verfahren zum Reinigen von Gegenständen gemäß Oberbegriff des Anspruchs 1.The present invention relates to a method for cleaning objects according to the preamble of claim 1.

Ein gattungsgemäßes Verfahren ist bekannt aus der nicht vorveröffentlichten deutschen Patentanmeldung P 43 09 096.A generic method is known from the unpublished German patent application P 43 09 096.

Zu reinigende Gegenstände, im vorliegenden Falle insbesondere solche aus Stahl, werden in einem Reinigungsbad durch Eintauchen, gegebenenfalls mit Ultraschallunterstützung, einem Reinigungsvorgang unterzogen, und anschließend in einem ersten wäßrigen Spülbad vom Reinigungsbad befreit. Wegen der in das erste Spülbad eingeschleppten Verunreinigungen ist zur einwandfreien Spülung ein zweites Spülbad empfehlenswert, an das sich ein Trocknungsvorgang anschließt.Objects to be cleaned, especially those made of steel in the present case, are subjected to a cleaning process in a cleaning bath by immersion, optionally with ultrasound assistance, and are then freed from the cleaning bath in a first aqueous rinsing bath. Because of the impurities introduced into the first rinsing bath, a second rinsing bath is recommended for perfect rinsing, which is followed by a drying process.

Insbesondere bei Stahlgegenständen, aber auch bei anderen Metallen wie z.B. Aluminium besteht aufgrund der Wasserreste auf dem Material während des Trocknungsvorganges die Gefahr eines Anfluges von Korrosion.Especially with steel objects, but also with other metals such as Due to the water residues on the material during the drying process, aluminum is at risk of corrosion.

Diese Korrosion erweist sich insbesondere dann als problematisch, wenn die getrockneten Gegenstände weiterverarbeitet werden sollen, beispielsweise indem eine Beschichtung vorgesehen werden soll.This corrosion proves to be particularly problematic when the dried objects are to be processed further, for example by providing a coating.

Der vorliegenden Erfindung liegt das Problem zugrunde, das Risiko einer Korrosion herabzusetzen.The problem underlying the present invention is to reduce the risk of corrosion.

Die Aufgabe wird gelöst durch ein Verfahren gemäß Anspruch 1.The object is achieved by a method according to claim 1.

Erfindungsgemäß ist vorgesehen, dem letzten Spülbad einen Zusatz eines Gemisches aus Propylenglykolmethylether und Propylenglykolether hinzuzugeben. Überraschenderweise hat sich erwiesen, daß unter einem Zusatz eines derartigen Glycoläthergemisches dieser angegebenen Zusammensetzung das Abfließverhalten des Wassers von den aus dem Wasser entnommenen Gegenständen erheblich verbessert, das Wasser fließt vorhangartig ab. Zugleich bildet sich offensichtlich ein filmartiger Überzug, der für einen begrenzten Zeitraum von etwa 24 Stunden einen wirksamen Schutz gegen Oxidation und dementsprechende Korrosion bietet.According to the invention, an addition of a mixture of propylene glycol methyl ether and propylene glycol ether is added to the last rinsing bath. Surprisingly, it has been found that the addition of such a glycol ether mixture to this composition improves the outflow behavior of the water from the objects removed from the water, and the water flows out like a curtain. At the same time, a film-like coating is evidently formed, which offers effective protection against oxidation and corresponding corrosion for a limited period of about 24 hours.

Das letzte Spülbad besteht, um Fleckenbildung zu verhindern, aus voll entsalztem Wasser (VE-Wasser). Das erwähnte Glykoläthergemisch wird in einer Konzentration von etwa 10 Gewichtsprozent bis 50 Gewichtsprozent dem VE-Wasser zugesetzt.The last rinsing bath consists of deionized water (deionized water) to prevent staining. The glycol ether mixture mentioned is added to the deionized water in a concentration of about 10 percent by weight to 50 percent by weight.

Als besonders geeignet haben sich als Propylenglykolmethylether ein Propylenglykolmonoethylether der Formel

Figure imgb0001

und als Propylenglykolether ein Propylenglykol-n-Butylether der Formel
Figure imgb0002
erwiesen.A propylene glycol monoethyl ether of the formula has proven to be particularly suitable as propylene glycol methyl ether
Figure imgb0001
and as propylene glycol ether a propylene glycol n-butyl ether of the formula
Figure imgb0002
proven.

Beispiel 1:Example 1:

Zu reinigende Metallteile aus Stahl werden in einem Reinigungsbad aus Glykoläthern behandelt und anschließend in einem ersten wäßrigen Bad von den Rückständen des Reinigungsbades gesäubert. Um eine vollständige Entfernung der Reinigungsbadrückstände, auch der, die in das erste Spülbad verschleppt wurden, zu erzielen, werden die Teile in einem zweiten Bad aus voll entsalztem Wasser gespült und anschließend in einem Warmluftstrom getrocknet. Die Trocknungszeit beträgt etwa drei Minuten, sie ist stark von der Temperatur des Warmluftstromes und der Luftgeschwindigkeit abhängig.Metal parts to be cleaned made of steel are treated in a glycol ether cleaning bath and then cleaned of the residues of the cleaning bath in a first aqueous bath. In order to achieve complete removal of the cleaning bath residues, including those that were carried over into the first rinsing bath, the parts are rinsed in a second bath from demineralized water and then dried in a hot air stream. The drying time is about three minutes, it is strongly dependent on the temperature of the warm air flow and the air speed.

Bereits unmittelbar nach der Trocknung ist mit bloßem Auge ein Anflug von Rost erkennbar.A hint of rust can be seen with the naked eye immediately after drying.

Beispiel 2:Example 2:

Die gleichen Metallteile wie in Beispiel 1 werden in dem gleichen Reinigungsbad behandelt und ebenfalls im ersten Spülbad von den Rückständen gesäubert. Dem zweiten Spülbad jedoch ist ein Gemisch von Propylenglykolmonoethylether der Formel

Figure imgb0003

und Propylenglykol-n-Butylether der Formel
Figure imgb0004
in Anteilen von 80 Gew.% Propylenglykolmonoethylether und 20 Gew.% Propylenglykol-n-Butylether zugesetzt.The same metal parts as in Example 1 are treated in the same cleaning bath and the residues are also cleaned in the first rinsing bath. The second rinsing bath however, is a mixture of propylene glycol monoethyl ether of the formula
Figure imgb0003
and propylene glycol n-butyl ether of the formula
Figure imgb0004
in proportions of 80% by weight of propylene glycol monoethyl ether and 20% by weight of propylene glycol n-butyl ether.

Durch ein vorhangartiges Ablaufen des Spülbades von den nach dem Spülen entnommenen Gegenständen konnte die Trocknungszeit um 50 % reduziert werden. Auch nach 24 Stunden zeigte sich auch bei sorgfältiger Prüfung immer noch kein Korrosionsanflug, innerhalb dieser Zeit konnten somit die getrockneten Teile ohne weitere Schutzmaßnahmen weiterverarbeitet, z.B. beschichtet werden.The drying time could be reduced by 50% by draining the rinsing bath from the items removed after rinsing. Even after 24 hours, even with careful inspection, there was still no corrosion, within this time the dried parts could be processed without further protective measures, e.g. be coated.

Claims (5)

Verfahren zum Reinigen von Gegenständen, insbesondere metallenen Gegenständen, wobei die Gegenstände erst einem Reinigungsbad und anschließend mindestens einem wäßrigen Spülbad unterzogen werden,
dadurch gekennzeichnet, daß dem letzten Spülbad ein Zusatz von 10 bis 50 Gewichtsprozent Glycoläthern zugesetzt wird in folgender Zusammensetzung:
60 - 90 % Gewichtsprozent Propylenglykolethylether der Formel
Figure imgb0005
 wobei R₁ ausgewählt ist aus der Gruppe CH₃, C₂H₅, n-C₃H₇ oder iso-C₃H₇,
und 30 bis 10 Gewichtsprozent Propylenglykolether der Formel
Figure imgb0006
 wobei R₂ ausgewählt ist aus der Gruppe n-C₃H₇, iso-C₃H₇, n-C₄H₉ oder iso-C₄H₉.Process for cleaning objects, in particular metal objects, the objects first being subjected to a cleaning bath and then to at least one aqueous rinsing bath,
characterized in that an addition of 10 to 50 percent by weight glycol ethers is added to the last rinsing bath in the following composition:
60-90% by weight propylene glycol ethyl ether of the formula
Figure imgb0005
 where R₁ is selected from the group CH₃, C₂H₅, n-C₃H₇ or iso-C₃H₇,
and 30 to 10 weight percent propylene glycol ether of the formula
Figure imgb0006
 wherein R₂ is selected from the group n-C₃H₇, iso-C₃H₇, n-C₄H₉ or iso-C₄H₉. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Propylenglykolethylether ein Propylenglykolmonoethylether der Formel
Figure imgb0007
 zugesetzt wird.Process according to Claim 1, characterized in that a propylene glycol monoethyl ether of the formula is used as the propylene glycol ethyl ether
Figure imgb0007
 is added. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß als Propylenglykolether ein Propylenglykol-n-Butylether der Formel
Figure imgb0008
 zugesetzt wird.Process according to Claim 1 or 2, characterized in that a propylene glycol n-butyl ether of the formula is used as the propylene glycol ether
Figure imgb0008
 is added. Verwendung eines Gemisches von Glycoläthern der Zusammensetzung
60 - 90 % Gewichtsprozent Propylenglykolethylether der Formel
Figure imgb0009
 wobei R₁ ausgewählt ist aus der Gruppe CH₃, C₂H₅, n-C₃H₇ oder iso-C₃H₇,
und 40 bis 10 Gewichtsprozent Propylenglykolether der Formel
Figure imgb0010
 wobei R₂ ausgewählt ist aus der Gruppe n-C₃H₇, iso-C₃H₇, n-C₄H₉ oder iso-C₄H₉
als Zusatzmittel zu wäßrigem Spülbad zur Verbesserung des Abfließverhaltens des Wassers und zur Erzielung eines intermediären Korrosionsschutzes.Use of a mixture of glycol ethers of the composition
60-90% by weight propylene glycol ethyl ether of the formula
Figure imgb0009
 where R₁ is selected from the group CH₃, C₂H₅, n-C₃H₇ or iso-C₃H₇,
and 40 to 10 weight percent propylene glycol ether of the formula
Figure imgb0010
 wherein R₂ is selected from the group n-C₃H₇, iso-C₃H₇, n-C₄H₉ or iso-C₄H₉
as an additive to an aqueous rinsing bath to improve the drainage behavior of the water and to achieve intermediate corrosion protection. Verwendung eines Gemisches von Glycoläthern der Zusammensetzung
60 - 90 % Gewichtsprozent Propylenglykolmonoethylether der Formel
Figure imgb0011
 und 40 bis 10 Gewichtsprozent Propylenglykol-n-Butylether der Formel
Figure imgb0012
 als Zusatzmittel zu wäßrigem Spülbad zur Verbesserung des Abfließverhaltens des Wassers und zur Erzielung eines intermediären Korrosionsschutzes.Use of a mixture of glycol ethers of the composition
60-90% by weight propylene glycol monoethyl ether of the formula
Figure imgb0011
 and 40 to 10 weight percent propylene glycol n-butyl ether of the formula
Figure imgb0012
 as an additive to an aqueous rinsing bath to improve the drainage behavior of the water and to achieve intermediate corrosion protection.
EP94109602A 1993-07-27 1994-06-22 Method for cleaning articles Expired - Lifetime EP0636710B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4325133 1993-07-27
DE4325133A DE4325133A1 (en) 1993-07-27 1993-07-27 Process for cleaning objects

Publications (2)

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EP0636710A1 true EP0636710A1 (en) 1995-02-01
EP0636710B1 EP0636710B1 (en) 1996-11-13

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EP94109602A Expired - Lifetime EP0636710B1 (en) 1993-07-27 1994-06-22 Method for cleaning articles

Country Status (6)

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US (1) US5626818A (en)
EP (1) EP0636710B1 (en)
JP (1) JPH07171521A (en)
AT (1) ATE145254T1 (en)
CA (1) CA2128846A1 (en)
DE (2) DE4325133A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5610132A (en) * 1994-06-24 1997-03-11 Tokuyama Corporation Cleaning agent for removing fats and oils from metal surfaces

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US6125395A (en) * 1999-10-04 2000-09-26 Piiq.Com, Inc. Method for identifying collections of internet web sites with domain names
CN100419124C (en) * 2005-02-07 2008-09-17 长江大学 Inhibitor for controlling electric dipole corrosion

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JPH01149981A (en) * 1987-12-07 1989-06-13 Showa Shell Sekiyu Kk Water soluble degreasing composition
EP0376367A1 (en) * 1988-12-29 1990-07-04 METALLGESELLSCHAFT Aktiengesellschaft Aqueous cleaning agent for metal surfaces
EP0426943A2 (en) * 1989-11-08 1991-05-15 Arakawa Chemical Industries, Ltd. Agent and method for removing rosinbase solder flux
DE4130494A1 (en) * 1991-09-13 1993-04-01 Ant Nachrichtentech Liq. mixt. for cleaning, esp. removing traces of solder - contains alcohol, glycol ether and opt. deionised water
WO1993006204A1 (en) * 1991-09-24 1993-04-01 The Dow Chemical Company Semi-aqueous cleaning process and solvent compositions
EP0587917A1 (en) * 1992-08-07 1994-03-23 DR.O.K. WACK CHEMIE GmbH Cleaning agent

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Publication number Priority date Publication date Assignee Title
JPH01149981A (en) * 1987-12-07 1989-06-13 Showa Shell Sekiyu Kk Water soluble degreasing composition
EP0376367A1 (en) * 1988-12-29 1990-07-04 METALLGESELLSCHAFT Aktiengesellschaft Aqueous cleaning agent for metal surfaces
EP0426943A2 (en) * 1989-11-08 1991-05-15 Arakawa Chemical Industries, Ltd. Agent and method for removing rosinbase solder flux
DE4130494A1 (en) * 1991-09-13 1993-04-01 Ant Nachrichtentech Liq. mixt. for cleaning, esp. removing traces of solder - contains alcohol, glycol ether and opt. deionised water
WO1993006204A1 (en) * 1991-09-24 1993-04-01 The Dow Chemical Company Semi-aqueous cleaning process and solvent compositions
EP0587917A1 (en) * 1992-08-07 1994-03-23 DR.O.K. WACK CHEMIE GmbH Cleaning agent

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Publication number Priority date Publication date Assignee Title
US5610132A (en) * 1994-06-24 1997-03-11 Tokuyama Corporation Cleaning agent for removing fats and oils from metal surfaces

Also Published As

Publication number Publication date
DE59401027D1 (en) 1996-12-19
CA2128846A1 (en) 1995-01-28
US5626818A (en) 1997-05-06
ATE145254T1 (en) 1996-11-15
JPH07171521A (en) 1995-07-11
DE4325133A1 (en) 1995-02-02
EP0636710B1 (en) 1996-11-13

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